4
Receiver Section
The receiver section includes the Receiver Optical Sub-
Assembly (ROSA) and the amplication/quantization cir-
cuitry. The ROSA, containing a PIN photodiode and cus-
tom transimpedance amplier, is located at the optical
interface and mates with the LC optical connector. The
ROSA output is fed to a custom IC that provides post-
amplication and quantization.
Receiver Loss of Signal (Rx_LOS)
The post-amp IC also includes transition detection cir-
cuitry which monitors the AC level of incoming optical
signals and provides a LVTTL/CMOS compatible status
signal to the host. A high status signal indicates loss of
modulated signal, indicating link failures such as broken
ber or failed transmitter. Rx_LOS can also be monitored
via the two-wire serial interface (address A2h, byte 110,
bit 1).
Functional Data I/O
The AFCT-701SDZ interfaces with the host circuit board
through the twenty contact SFP+ electrical connector.
See Table 2 for contact descriptions. The module edge
connector is shown in Figure 3. The host board layout for
this interface is depicted in Figure 6.
The AFCT-701SDZ high speed transmit and receive in-
terfaces require SFF-8431 compliant signal lines on the
host board. To simplify board requirements, biasing re-
sistors and AC coupling capacitors are incorpo rated into
the SFP+ transceiver module (per SFF-8431) and hence
are not required on the host board. The TX_DISABLE, TX_
FAULT and RX_LOS signals require LVTTL signals on the
host board (per SFF-8431) if used. If an application does
not take advantage of these func tions, care must be tak-
en to ground TX_DISABLE to enable normal operation.
Figure 2 depicts the recom mended interface circuit to
link the AFCT-701SDZ to supporting physical layer ICs.
Timing for the dedicated SFP+ control signals imple-
mented in the transceiver are listed in Figure 5.
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFCT-701SDZ. Please contact
your local Field Sales representative for availability and
ordering details.
Caution
There are no user serviceable parts nor maintenance
requirements for the AFCT-701SDZ. All mechanical ad-
justments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improperly han-
dling the AFCT-701SDZ will void the product warranty. It
may also result in improper operation and possibly over-
stress the laser source. Performance degrada tion or de-
vice failure may result. Connection of the AFCT-701SDZ
to a light source not compliant with IEEE Std. 802.3ae
Clause 52 and SFF-8341 specications, operating above
maximum operating conditions or in a manner inconsis-
tent with it’s design and function may result in exposure
to hazardous light radiation and may constitute an act
of modifying or manufacturing a laser product. Persons
performing such an act are required by law to recertify
and re-identify the laser product under the provisions of
U.S. 21 CFR (Subchapter J) and TUV.
Customer Manufacturing Processes
This module is pluggable and is not designed for aque-
ous wash, IR reow, or wave soldering processes.
Ordering Information
Please contact your local eld sales engineer or one of
Avago Technologies franchised distributors for ordering
information. For technical information, please visit Ava-
go Technologies’ WEB page at www.avagotech.com. For
information related to SFF Committee documentation
visit www.scommittee.org.
